<template>
	<div class="upload-box">
		<el-upload
			action="#"
			list-type="picture-card"
			:class="['upload', self_disabled ? 'disabled' : '', drag ? 'no-border' : '']"
			v-model:file-list="_fileList"
			:multiple="true"
			:disabled="self_disabled"
			:limit="limit"
			:http-request="handleHttpUpload"
			:before-upload="beforeUpload"
			:on-exceed="handleExceed"
			:on-success="uploadSuccess"
			:on-error="uploadError"
			:drag="drag"
			accept="image/*"
		>
			<div class="upload-empty">
				<slot name="empty">
					<el-icon><Plus /></el-icon>
					<!-- <span>请上传图片</span> -->
				</slot>
			</div>
			<template #file="{ file }">
				<img :src="file.url" class="upload-image" />
				<div class="upload-handle" @click.stop>
					<div class="handle-icon" @click="handlePictureCardPreview(file)">
						<el-icon><ZoomIn /></el-icon>
						<span>查看</span>
					</div>
					<div class="handle-icon" @click="handleRemove(file)" v-if="!self_disabled">
						<el-icon><Delete /></el-icon>
						<span>删除</span>
					</div>
				</div>
			</template>
		</el-upload>
		<div class="el-upload__tip">
			<slot name="tip"></slot>
		</div>
		<el-image-viewer v-if="imgViewVisible" @close="imgViewVisible = false" :url-list="[viewImageUrl]" />
	</div>
</template>

<script setup lang="ts" name="UploadImgs">
import { ref, computed, inject, watch } from 'vue';
import { Plus } from '@element-plus/icons-vue';
import type { UploadProps, UploadFile, UploadUserFile, UploadRequestOptions } from 'element-plus';
import { ElNotification, formContextKey, formItemContextKey } from 'element-plus';
import { FileParameter } from '@/shared/service-proxies';
import apiHttpClient from '@/utils/http';

interface UploadFileProps {
	fileList: UploadUserFile[];
	api?: (params: any) => Promise<any>; // 上传图片的 api 方法，一般项目上传都是同一个 api 方法，在组件里直接引入即可 ==> 非必传
	drag?: boolean; // 是否支持拖拽上传 ==> 非必传（默认为 true）
	disabled?: boolean; // 是否禁用上传组件 ==> 非必传（默认为 false）
	limit?: number; // 最大图片上传数 ==> 非必传（默认为 5张）
	fileSize?: number; // 图片大小限制 ==> 非必传（默认为 5M）
	fileType?: File.ImageMimeType[]; // 图片类型限制 ==> 非必传（默认为 ["image/jpeg", "image/png", "image/gif"]）
	height?: string; // 组件高度 ==> 非必传（默认为 150px）
	width?: string; // 组件宽度 ==> 非必传（默认为 150px）
	borderRadius?: string; // 组件边框圆角 ==> 非必传（默认为 8px）
}

const props = withDefaults(defineProps<UploadFileProps>(), {
	fileList: () => [],
	drag: true,
	disabled: false,
	limit: 5,
	fileSize: 5,
	fileType: () => [],
	height: '150px',
	width: '150px',
	borderRadius: '8px',
});

// 获取 el-form 组件上下文
const formContext = inject(formContextKey, void 0);
// 获取 el-form-item 组件上下文
const formItemContext = inject(formItemContextKey, void 0);
// 判断是否禁用上传和删除
const self_disabled = computed(() => {
	return props.disabled || formContext?.disabled;
});

const _fileList = ref<UploadUserFile[]>(props.fileList);

// 监听 props.fileList 列表默认值改变
watch(
	() => props.fileList,
	(n: UploadUserFile[]) => {
		_fileList.value = n;
	}
);

/**
 * @description 文件上传之前判断
 * @param rawFile 选择的文件
 * */
const beforeUpload: UploadProps['beforeUpload'] = (rawFile) => {
	const imgSize = rawFile.size / 1024 / 1024 < props.fileSize;
	const imgType = props.fileType.length == 0 || props.fileType.includes(rawFile.type as File.ImageMimeType);
	if (!imgType)
		ElNotification({
			title: '温馨提示',
			message: '上传图片不符合所需的格式！',
			type: 'warning',
		});
	if (!imgSize)
		setTimeout(() => {
			ElNotification({
				title: '温馨提示',
				message: `上传图片大小不能超过 ${props.fileSize}M！`,
				type: 'warning',
			});
		}, 0);
	return imgType && imgSize;
};

/**
 * @description 图片上传
 * @param options upload 所有配置项
 * */
const handleHttpUpload = async (options: UploadRequestOptions) => {
	let formData = new FormData();
	formData.append('file', options.file);
	try {
		const api = props.api ?? uploadImg;
		const data = await api(formData);
		const url = data.data.result[0].url;
		options.onSuccess(url);
	} catch (error) {
		options.onError(error as any);
	}
};

/**
 * @description 图片上传成功
 * @param response 上传响应结果
 * @param uploadFile 上传的文件
 * */
interface UploadEmits {
	(e: 'update:fileList', value: UploadUserFile[]): void;
}
const emit = defineEmits<UploadEmits>();
const uploadSuccess = (response: string | undefined, uploadFile: UploadFile) => {
	if (!response) return;
	uploadFile.url = response;
	emit('update:fileList', _fileList.value);
	// 调用 el-form 内部的校验方法（可自动校验）
	formItemContext?.prop && formContext?.validateField([formItemContext.prop as string]);
	ElNotification({
		title: '温馨提示',
		message: '图片上传成功！',
		type: 'success',
	});
};

/**
 * 上传图片
 * @param params
 */
const uploadImg = (params: FileParameter) => {
	return apiHttpClient.upload('api/Files/UploadFile', params);
};

/**
 * @description 删除图片
 * @param file 删除的文件
 * */
const handleRemove = (file: UploadFile) => {
	_fileList.value = _fileList.value.filter((item) => item.url !== file.url || item.name !== file.name);
	emit('update:fileList', _fileList.value);
};

/**
 * @description 图片上传错误
 * */
const uploadError = () => {
	ElNotification({
		title: '温馨提示',
		message: '图片上传失败，请您重新上传！',
		type: 'error',
	});
};

/**
 * @description 文件数超出
 * */
const handleExceed = () => {
	ElNotification({
		title: '温馨提示',
		message: `当前最多只能上传 ${props.limit} 张图片，请移除后上传！`,
		type: 'warning',
	});
};

/**
 * @description 图片预览
 * @param file 预览的文件
 * */
const viewImageUrl = ref('');
const imgViewVisible = ref(false);
const handlePictureCardPreview: UploadProps['onPreview'] = (file) => {
	viewImageUrl.value = file.url!;
	imgViewVisible.value = true;
};
</script>

<style scoped lang="scss">
.is-error {
	.upload {
		:deep(.el-upload--picture-card),
		:deep(.el-upload-dragger) {
			border: 1px dashed var(--el-color-danger) !important;
			&:hover {
				border-color: var(--el-color-primary) !important;
			}
		}
	}
}
:deep(.disabled) {
	.el-upload--picture-card,
	.el-upload-dragger {
		cursor: not-allowed;
		background: var(--el-disabled-bg-color) !important;
		border: 1px dashed var(--el-border-color-darker);
		&:hover {
			border-color: var(--el-border-color-darker) !important;
		}
	}
}
.upload-box {
	.no-border {
		:deep(.el-upload--picture-card) {
			border: none !important;
		}
	}
	:deep(.upload) {
		.el-upload-dragger {
			display: flex;
			align-items: center;
			justify-content: center;
			width: 100%;
			height: 100%;
			padding: 0;
			overflow: hidden;
			border: 1px dashed var(--el-border-color-darker);
			border-radius: v-bind(borderRadius);
			&:hover {
				border: 1px dashed var(--el-color-primary);
			}
		}
		.el-upload-dragger.is-dragover {
			background-color: var(--el-color-primary-light-9);
			border: 2px dashed var(--el-color-primary) !important;
		}
		.el-upload-list__item,
		.el-upload--picture-card {
			width: v-bind(width);
			height: v-bind(height);
			background-color: transparent;
			border-radius: v-bind(borderRadius);
		}
		.upload-image {
			width: 100%;
			height: 100%;
			object-fit: contain;
		}
		.upload-handle {
			position: absolute;
			top: 0;
			right: 0;
			box-sizing: border-box;
			display: flex;
			align-items: center;
			justify-content: center;
			width: 100%;
			height: 100%;
			cursor: pointer;
			background: rgb(0 0 0 / 60%);
			opacity: 0;
			transition: var(--el-transition-duration-fast);
			.handle-icon {
				display: flex;
				flex-direction: column;
				align-items: center;
				justify-content: center;
				padding: 0 6%;
				color: aliceblue;
				.el-icon {
					margin-bottom: 15%;
					font-size: 140%;
				}
				span {
					font-size: 100%;
				}
			}
		}
		.el-upload-list__item {
			&:hover {
				.upload-handle {
					opacity: 1;
				}
			}
		}
		.upload-empty {
			display: flex;
			flex-direction: column;
			align-items: center;
			font-size: 12px;
			line-height: 30px;
			color: var(--el-color-info);
			.el-icon {
				font-size: 28px;
				color: var(--el-text-color-secondary);
			}
		}
	}
	.el-upload__tip {
		line-height: 15px;
		text-align: center;
	}
}
</style>
